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J. J. TANNER.

EXTENSION CLAMP.

(No Model.)

Patented Jan. 28, 1890'.

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UNITED STATES JESSE J. TANNER, on ONEIDA, NEW YORK, ASSIGNOR or oNE nALETo ROBERTJ. FISH AND DANIEL o. BURKE, or SAME PLACE.

EXTENSION-CLAN! P.

SPECIFICATION forming part of Letters Patent No. 420,216, dated January28, 1890.

Application filed April 15 1389- To coZZ whom/it may coiwern:

Be it known that I, JESSE J. TANNER, of Oneida, in the county ofMadison, in the State of New York, have invented new and usefulImprovements in Extension-Clamps, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

This invention relates to that class of clamps in which the clamping-baris composed of two sections, one of which is provided with a series ofperforations at different points in the length thereof, and the othersection is provided with a hook which is adapted to be inserted in anyone of the aforesaid perforations, and thus permits of varying thelength of the clamp.

My present invention consists in an improved construction andcombination of the constituent members of the clamp, as hereinafterdescribed, and specifically set forth in the claims.

In the annexed drawings, Figure 1 is a plan view of the clamp, showingits application in the construction of a door in dotted lines. Fig. 2 isa side view of the same. Figs. 3 and 4: are enlarged transversesections, respectively, on lines o: w and y y, Fig.

2; and Fig 5 is a detached side view of one.

of the clamping-bars.

Similar letters of reference indicate corresponding parts.

a represents an arm constituting one of the clamping-bars. Said arm isformed with a longitudinal channel a, and with a series of perforationsc c 0 through the bottom of the channel at different points in thelength thereof, as shown in Fig. l of the drawings. To one end of saidarm is rigidly attached a bracket 1), which projects from the channelside of the arm, and is formed with a screwthreaded eye I) which isaxiallyparallel with the channel a, and in said eye works theclamping-screw (Z, which is provided with a crank or suitable handle forturning it.

The attachment of the bracket 1), I prefer to effect by perforating theside walls of the channel a, as shown at i 'i, and forming the bracket17 with a tongue t and flanges g g, the tongue being inserted intochannel a and Serial No. 307,239. (No model.)

perforated to correspond with the holes t' 1 and bolts or rivets h hpass through the perforations of the said parts, as shown in Fig. 3 ofthe drawings. The bottom of the channel a being cut away at theattachment of the bracket 19, allows the two side walls of said channelto be clamped tightly against opposite sides of the tongue, and when thesaid parts are thus united the flanges g grest on the edges of thechanneled side of the arm a, and thus further stay the bracket in itsposition.

'1' denotes the companion clamping-bar, which is of the form of a rodwhich lies in the channel a, so as to be confined from lateral movementin three directions. This rod is formed with a hook or hooks e at one orboth ends, preferably at both ends, for the purpose of rendering thesame reversible end for end, and thus afford greater range ofadjustment. One end of the rod 1' has a gudgeon l projecting from theside opposite to that from which the hook 6 projects, and on thisgudgeon is swiveled a block a, which serves as a shoulder or one of thebearings by which the clamp takes hold of the work or article to beclamped. Said swivel-connection allows the block to accommodate itselfto various angles of the surface with which it is to be brought incontact. In order to prevent the rod from accidentally dropping out ofthe channel a when the arm a is placed in an inverted position, I formthe rod r with an end extension 0" beyond the hook e. The bearing ofsaid extension on the bottom of the interior of the channel a preventsthe free end of the rod 0 from swinging away from the arm a.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

l. The improved extensible clamp consisting of the arm a, formed withthe longitudinal channel a, provided with perforations c c c, thebracket I), attached to one end of said arm and projecting from thechanneled side thereof and provided with the screw-threaded eye 11',standing axially parallel with the channel of said arm, the screw cl,working in said eye, and the rod r, lying in the channel a and formedwith the book 6, entering one of the perforations c, and with a shoulderfor engaging the work to be clamped, all constructed and combinedsubstantially in the manner described and shown.

2. In a clamp of the character herein described, the arm a, formed withthe longitudinal channel a, provided with perforations 0 0 through thebottom of said channel and with holes 2' z' through the sides of oneend, the bracket 1), formed with the screw-threaded eye I), perforatedtongue 25, and flanges g, and seated with the tongue in the channel aand with the flanges on the edges of the channeled side of the arm a,and bolts or rivets h 71-, passing through the holes 2' 2' and perforated tongue, and the screw d, working in the eye b, in combinationwith the rod 1*, provided with hooks e e and the gudgeon Z,substantially as described and shown.

3. In combination with the arm a, formed with the longitudinal channel aand perforations c c 0 through the bottom of said channel, and theclamping-screw d on one end of said arm, the rod 7', lying in thechannel and adapted to be reversed end for end and provided at oppositeends with the hooks e e and at one end with the gudgeon Z, and block 11,swiveled on said gudgeon, substantially as described and shown. I

4. In combination with the arm a, formed with the longitudinal channel aand perforations c c a through the bottom of said channel and theclamping-screw on one end of said arm, the rod 0", lying in the channela and formed with the hook e and with the extension r beyond the saidhook, and a shoulder or gudgeon projecting from the opposite side of therod, substantially as described and shown. I

In testimony whereof I have hereunto signed my name this 11th day ofApril,1889.

JESSE J. TANN ER. [L.S.] Witnesses:

J. J. LAASS, O. H. DUELL.

